Star Wars: Revenge of the Sith is probably the worst from the prequel trilogy. But for some reason, there's a prevailing myth that it was the one redeeming film from an otherwise disappointing prequel trilogy.
Why is this?
The new villain is forgettable, the melodrama is womanly, the visual effects are overblown and showy, the music is unjustly epic. It sucks.
I really think Star Wars nerds just wanted more from the original trilogy, and rated RotS highly because it featured a tiny amount of callback fan service.